Thank you for the suggestions everyone!

We have been waiting to see what the last antibiotics, the Propen LA and the sulpha boluses would do and the cow is better. The hind hoof wasn't cracking above the toe like the front was. The hind  is much better and the leakage from the front foot has almost stopped. I don't know if the drugs, all or any of them, caused the improvement.  Should I re-dose with any of them or hope the hoof rot has run it's course and will get better now?